Flow-control valve

PFR24A proportional flow-control valve gives pressure-compensated flow control to 28 l/min, working at 210 bar. Featuring simple, two-port, spool-type design, there is no current applied so the spool blocks the ring of holes in cartridge nose, preventing flow to outlet port. It compensates in both directions for use as bleed-off valve in systems using a fixed pump. With a hysterisis of better than 4% at PWM cycle rate of 200-400 Hz and 6% without PWM, it has response time of 300 msec and internal leakage of 200 ml/min.